’America is the strongest and most prosperous nation on earth,’ Nately informed him with lofty fervor and dignity.

Italy, on the other hand, is one of the least prosperous nations on earth.

He wondered how many people were destitute that same night even in his own prosperous country, how many homes were shanties, how many husbands were drunk and wives socked, and how many children were bullied, abused or abandoned.

There are no more uses of "prosperous" in the book.

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She owns a prosperous law firm.

But in spite of these disadvantages, he had begun even in his father’s lifetime to lay the foundations of a prosperous future.